Hamzah, S., Ani, F., Halim, H., Sholeh Saad, S., Sarawati Johar, S., Akmal Damin, Z., Jaes, L., & Nubli Abdul Wahab, M. (2018). A Study on the effect of stroop test on the formation of students discipline by using the heart rate variability (HRV) technique. International Journal of Engineering and Technology, 7(4.9), 178-181. https://doi.org/10.14419/ijet.v7i4.9.20668